The vast majority of its population came from three lunar empires—the humans from Manaan, the elves from Alorea, and the dwarves as well as their gnomish cousins from Kragdûr. The fellfolk, a race of small but fierce people, are the planet's original inhabitants. Calidar is imbued with a feral magic hostile to the expansion of civilization, a dangerous world only partially settled by the three outer world empires. A central region called the Great Caldera, a three-thousand-mile-large crater partially filled with an inner sea and ringed with towering mountains, serves as the cradle of civilization. There, the empires overcame nature’s ferocity and established sprawling colonies. But over time, they rebelled and, after a long period of conflict known as the Sky Wars, the new realms earned their independence from the overlords. A fragile truce now remains between the three empires and their former colonies. Beyond the Great Caldera lies what is known as the Dread Lands.

The truth is that two lunar empires are overpopulated and exceeding their natural resources. The other, more attuned to nature, now stagnates, unwilling to further harm its own world. It was the reason for the rush to establish colonies on Calidar. There was, and still is, another reason. Traveling the immense distances between Calidar and its moons, and reaching other worlds gravitating around the Great Soltan is only possible with a certain type of magic. At the heart of imperial rivalries lies a strange substance called Seitha, which enables skyships to become incorporeal and travel at fantastic speeds. Though it can be found on the moons, the existence of the precious Seitha has been declining there since its discovery. The Dread Lands now remain its principal source and the origin of many conflicts to obtain it.

The appearance of the substance in Calidar’s soil is predicated upon the health of that world and its moons. It is believed that all magic comes from the beating heart of Calidar, tying together not only Seitha but the souls of the dead and the very lifeforce of all that dwells on its surface, in the skies, and beyond—be it flora, fauna, or sentient kind. It is strong enough to enable gods to spring from the inhabitants’ spiritual beliefs. Indeed, Calidar is unique in that the divine did not create this universe and its people. It is quite the opposite. To each world its own gods, demi-gods, epic heroes, and demons competing to retain the favors of mortals who created them, and to sway the minds of others for the sake of eternal hegemony... or oblivion.